What are the advantages of Diamond honed valve guides and tuffrided valves you call “DOUBLE DIAMOND”?
The diamond honing process provides perfectly sized, accurate and straight valve guide bores with a cross hatch surface (as with cylinder bores) to provide the best oil retention and wear resistance. Valves are diamond hard and have incredible wear resistance, valve guides & stems don’t wear, increasing head life dramatically, possibly as much as four or five times that of a standard head.
